Olaf is one of the main characters in the film Frozen. When Anna and Elsa were younger, they created a snowman and named him Olaf when they played in the snow.

Elsa created a living snowman as she fled Arendell as an adult, and the snowman based itself on the one she created as a child. Anna and Kristoff encountered Olaf on their quest to find Elsa. He joined them, and later, helped to keep Anna warm after Elsa froze her heart.

Olaf loves warm hugs, and throughout the film, constantly expressed interest in knowing exactly what "warm" was. After Elsa thawed Arendell, he was given a personal cold spot, which hovered above him no matter what, to make sure he would never thaw.